Does anyone know?

Would need more info. There's actually a lot to choosing spring rates. They're not one size fits all. Also your choices will depend on what you are using your car for; DD, drag, auto-x, or circuit. Vehicle ride height, weight frt/rear & anti roll-bars are part of the overall calculations too. Ideally you're trying to balance the car.

lucid15 said:

Which hypercoils (brand? or is hypercoil or a brand?) do people usually go with on the DG/Koni setup? Im pretty set on 650/350 spring rates but not finding a good online vendor that just sells the main springs not the helper springs.

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Hypercoils is a brand. You can use any 2.25" inner diameter coilover spring.